Basic shapes are the fundamental forms that make up our world. The most common shapes include circle, square, triangle, and rectangle. Each shape has unique properties; for example, a circle has no corners and is defined by its radius, while a square has four equal sides and four right angles. These shapes can be found in everyday objects, such as a clock (circle), a window (rectangle), or a slice of pizza (triangle). Understanding these basic shapes helps in recognizing patterns and structures in art, architecture, and nature.